Heat sink fins



FIG. 1 is a side perspective view of the heat sink fins showing our new design;

FIG. 2 is a side perspective view thereof, opposite of that shown in FIG. 1;

FIG. 3 is an end view thereof;

FIG. 4 is an end view thereof, opposite of that shown in FIG. 3; and,

FIG. 5 is a bottom view thereof.

The potions shown in phantom lines are for showing environment only and do not form any part of the claimed design. 

The ornamental design for heat sink fins, as shown and described. 